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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffecfd11cf60820e40e53dc8a80d7b1a110de2abba71a481865fee9342cb9048' 
  AND token = 'mURI46qHao24cVSLT3pmWd5Q1aN0557G5KncPyGds7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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