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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5732301eeff69bc70d6e7e8277bed485e6b65ec290e4a1dbae605bef01061f' 
  AND token = 'TSp2kk1zjeVLQKkDns+FkLgSiiqe27HCh8n3ZRnizws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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