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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693c0343d92ad9ca88b39f687309e3d0b594810a0215482ec89348ada1a7e6fe' 
  AND token = '4UzmZkK96HCgsaqzaycmI5aI3pe6hGuZQksGmL6IjXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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