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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52c854997c2bdd75831424ee00729071840d4a288fe1253764d54d8e2edebaf' 
  AND token = 'MbgI8s4aX+7a7q3kPXY4HERPl4yj1V8307798Ypxerg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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