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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd061a3e247b29e03802be0fc0da195c5ac79f82fdb53876095869d5b9e4b6d' 
  AND token = '+IGjrPYHKlclNxUPhrAeeCwXIycO/Im29LupxGfSWnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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