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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5871261ad2e39c28ffb995f49952f5ae5fb5e426170f199cf12621a3a1c7c074' 
  AND token = 'NsMoo9vKrE8QKfZnTYhThogoMhdmWWMdIv54m05BN5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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