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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc620b4faa78d9ca2c69395114da690f031d8b01ce4ad4c79111cba58a1dfd5' 
  AND token = '6kjVTL97qdmyZtEzvtb70XgOX7BRXWr5fsMxwOtbzNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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