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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e3ee968e7c932e3b6c34bf1e169b1fb6186d42c3ea498b2227677b64e3f015' 
  AND token = '3arvM94bynJsN7wgCZdY8fbfUdLc+U8HsfXaNoFVf38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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