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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7895b8bd0cf00fff4ffa8021c9334cc8dd62fbf6cb740f2cbc1f6814769d914' 
  AND token = '9MGJ1r7EhLTxn8oYnCFOrCAq37xSJduJJD1u7TrxYpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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