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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98f7df1eb76e7a42468d77bceba3691d31011b37eef68a82d26c70e9f52677' 
  AND token = 'ZJl7coSMXVfMlCJumODld9JrsyZG6DCUJ0iBYjVLZg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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