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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75df47352d936914cb97bd42206a0e31fb5119fce5d03c28319f4a41a29f669' 
  AND token = 'UqzY8zZhUhGEkbqPlcsdWi6eMkZ/6Xs7EF/q3GxrdCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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