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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a1c2252c84959e78652aed7d38a22b1984cc13aa3e72f6eb4a6a684c486a84' 
  AND token = 'Q7pYvZ2YebyqCXe7f9Kb0NyzEg0aj7aStMaOJgiXM1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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