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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca6fcf17c2e717c8de08a005b30958bf4cec3444c51b14647e8dc5fc711c612' 
  AND token = 'G3ISISwAExRpBffmT+gsPVspdUt+MlM608I60KuOxk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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