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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3ceff6e2143ba2d2dc4dffbcddad4f87af6bb84b8589784a600908e483f79a' 
  AND token = 'aKzap0UxeygMvlaJDdYH8an/x2T9kd5Ar9pXoi5mTHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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