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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67c82640e54b2dc37d0b4ceea33d0e8dcbe1c6ff72ae0c5ebc2509849ee7d6f' 
  AND token = 'G0M71ODqUL6z+u0VzIBimRlzQ3pZROWLPw97TYovY00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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