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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69067969094b5064a863f37de2c26c500fc255281d552bf49c80513cb8a34893' 
  AND token = 'wdGXsq05e0+5FQ0e4OGLRMVlzU8n6pWtCN3UzLtfC4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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