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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7d1b9d13fb9d0f1993ed7bd2367a074efc94a7e89e81b8969a81d6c858614c' 
  AND token = 'XWGlbw1njOT08XMTEQna8JhFJNlJvbTnqj9d9vG027E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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