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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25cd79ce14a6a7ec5eacf9cf08929f8a668e1ee97369743639e16c0bcb7db940' 
  AND token = '6CE8wY4MZQEi6lZDTFFNfQKjTfecUnfX09PbcGuYjx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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