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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6949630131aece8c37d08aa96257d65b1a304072504341bcd0db95d2ba6c6712' 
  AND token = 'A33hOSr9e3BhAf8/D+3AUBCIcBIUi209XOKmijWTBlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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