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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecd22323c0401703d67dff8afa00e7acf3ba3fb8a6f764ffcc032bceba7e733' 
  AND token = 'bGDCVywVs3VUJd3X/4r+bDwFw4tIW1iQFJvpVvaoH1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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