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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c3060ffb07ade00228101698b8a85314c79b6d3b2b73277b3bfcc83c304f46' 
  AND token = '0VIfzKpQ1zy/TQZTn96vDI5yXxIkOvJrP4SITADJFKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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