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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2687420e41f5f3316a439fb20aa93e68bb38ee9eac0b2d5b7109930376b9d19' 
  AND token = 'jZhuo1E8C7a9ZLjHCbTtrLEhrfGGIlWlQUKlr33UFGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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