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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0576d26a2b776008aab6e493ae9e7237fc251127d1fc4d0276df6dd82219ab' 
  AND token = 'bOvxSCEt8SfvATYXKBhXKU6KEfyxu49Ewx0zSrV9GHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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