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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dd725457f5712af45b3c32ace001d1dcf5ca59995a1b4e2dc135620e395c33' 
  AND token = 'oJ8f8ocDcEfOGpHPjPra6pEu5FZIJm7amu0/dnIyuag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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