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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b914aa827e2ce6598774fc721cd4f559140eb6fe05224fcdef71d99695bc18eb' 
  AND token = 'sN2YLxommMt+UxbiYvIc9hJwVsu4wB7QQsWOY4exXz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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