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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd60ec6212c38e87a0246c57094589dd9738dacdc2a5c9f1254685054442fb7' 
  AND token = 'Lh8IZTg9UoG8Wz4BEkDbC0c3SjmsWNBHRZ6k91nmqJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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