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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b44d6ef78eb75e26aef404bd0556f437027c05ade5864a11cb6cb872f0e560' 
  AND token = 'S5twySKZuIE5Yw2hTrLcet34go055PXV3KMHL0m6z/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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