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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d843ecbb7fd2e14b228dbff53ade54a22e8d9f58a9a3b3d54266b5fc5358d2' 
  AND token = '4rrsc2qgXKzCM4VitX0nxBmWVOoBQS7Vycj+4MpqacM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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