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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472ad3818dbdc6c54a9bc2f0823a49f1720a7b150060345cd8bd10749d230b22' 
  AND token = 'y3Z4fzIeqkw2BRD24hKpjADRymOGR7l1+8ZHv51+C3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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