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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac36080cf7092dfdd14d4cf9719a9b9bbf698322665ebd453b834eed7f90c25' 
  AND token = 'KZ25iKe+sBGOUXfDRMZMDTrRI5cQYKflV0b1ZMBSKYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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