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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab467f46ce84ba19cec503bf7d9d6983e1e72ff80626d0885b674a3a2d49f498' 
  AND token = 'L1crUwkCc2ZTfGIrT8qjyeQzKZgcRrIg+T6RJdrMzJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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