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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa07308aa6a7e0389a14bef93f0d825b329943fa486cae3bb08f0bebd946226' 
  AND token = 'z5uT3dkNRkEfe0BjQSeFkoSARaxtS+4HMZfHzt6ILAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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