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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179c38c96f1b7e7bbc42a72e998a8f787c7e6267c4f882cee805e78e0a3b8ab8' 
  AND token = 'mwOPEP74SD3XS7/TeZlA/SsSfhjg+O6rYipCStkY7eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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