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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c607dbb09ce8a31fce1ffe757b869c231b5c476e78f8ee13176d8dede49a7b09' 
  AND token = 'XTg1dEufEq+baWY0ZfNaFhyf/PagEDV6DAheOdRgO34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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