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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5e64db511dcfc8b68a2288871bb2134a543b286bd7eeb439e6e61dafadeb98' 
  AND token = '2alZa+1g+qDwRTlfdk1KEdU58sFlvQTUQ293YGlwk+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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