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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3c4dc844604f8d8bd4fe266c437cfea9e9aa54e3b56eb919e10f5d58e44782' 
  AND token = 'eFPFWagyZQaYm1i83tB6o68UC5QwJC1Qvn++xGmAgD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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