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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583f804df66e1c347cceb77842caa94e7df868e4b8d2966a429c1f0480b03c69' 
  AND token = '/kZG3lXkqfPUqxENnP0Te8jLcq4kstn3+Z3LwaJhDbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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