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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24430cc96af2db7652eca38e5ad7fa636e7c73975509045deb94d5fbd0ecae10' 
  AND token = 'D5GBo5Xf53wlUJbQdekZI4qSCkSr1Mx7hK3JWEtpJK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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