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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69856deb0928087ec0f31257b85bf19e9c8ed1652a99a9d4b5e52f416783e619' 
  AND token = 'qqArdgYwMi9T3ay/qw11WSHr0354DNZzJ5ab8j7LyLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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