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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2ddfcae04e443d432267e80468e3f44706084d9b7b6c32ef559e59caaaa850' 
  AND token = 'dJDFCsePlu+wwanBiQMt4wjHQM2xjP7rgX50gbpsFFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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