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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5acddf71489d07a5475a016fe603546cd8a88dbfb962edc0000006f00d2d710' 
  AND token = 'R8Vu919HOZCwsRZ8JhkEYZI4kEV7JfqvxgCofdwEKTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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