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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f761f1d025b6fad20c3f3f5accc6b43a32a4d79818e4add1ac1be993832ba5' 
  AND token = 'gSbx5SP0lDIJB4TfMMRXofL0Z91CIslhqYWvmAhk4L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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