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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc6cbfd571ba9ddc1fddc0295ce26bec17e7e4b9c36bd15fc0bf97fd033a3c8' 
  AND token = 'GyAEYSW75f753KMeTT8SD5lBU5RQTeiLfMfLVX7tQ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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