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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66906c497e3b5ad1c72a968c6032029eaf4cb977e0427709afefab6434b5b833' 
  AND token = 'xRJbe8uvQmAzYJT+XC+hmM8lNWNB27Kz3s8spV1Itfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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