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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adbdf7a20d31f36ec1960e7ec15e4cd82a1e29cd3d8b3e167f7ef9ce48db0aa' 
  AND token = '2EkDqjFQo4eX8WvDzUgnH4TAYrTjQ3fBcpPlXR96uxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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