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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b318d37c5031cdf40b2a9e9c94b5b2fd99c6399a044824a66bebdba938e08f' 
  AND token = 'InktlVw5poQ6gEj0V1X8z5o/ta5RDt1FDtMBtHzTaSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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