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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f55259c30b573d326b68d467afdc4e08ee27e883f28824a1e60aa0301e698e9' 
  AND token = 'rRIsdzoikYALW6UUZ6/nfnlkDkwgfm90cVJj6y2tGU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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