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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9932fd6f2d59bfcabbe16e349d355a53663f64db0e0a6debe80715c65daf161b' 
  AND token = '8SETJgS1SYYvSfABgZRf9VUBtTW85gFi54/9meQEneY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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