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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c1a70630255d478c1e5c76e4ad82c762a2ece3185c852b4a1626f17eebb16a' 
  AND token = '82lCsckblEzhBAmscyZg/MC2Jn5I4cLJVLrXMNamvqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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