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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7952dec6d39207771c11571efd88e39d8eec6af92979ef22650176ba38f9227a' 
  AND token = 'uvd4J2gnea9ZI482w24iRWyVRv86Y8tEYWlVX8pCK5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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