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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbbe3e971fd5801a60f9dc1f1162de2a276e9c7eb4376bbb7e50d8eb23a40dd' 
  AND token = '0kKcvOVtDGOAShkOAdzffGtes/szeGMx9HDKVAC6tKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}