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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf72cea53290bce8a0089b664d2b657ae7af1b61d70801a309a950b249a6cd29' 
  AND token = 's3EucZD1A5UYe6a9W/pKuJjMlvgwefFJuc4mdkkE07k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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