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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd963910fd87c4d864b4e9ba9b226437dcb1c10250ae7107c036ced72cc02509b' 
  AND token = 'MhxxWCiJR56CpnZPQ7jgwZCoECb0skQoDPklV/j7rRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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