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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f07db1d16e1975a6a12579343999ff46165f0043483faf9f95ec21d69dc688' 
  AND token = 'w4dKWpK0QW1QwQ592ab7pXgc3+J1ZBM3X8/c2rPbV90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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