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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352a98c44b49aa5eb87e0770ec60ac1e8dfb3dc40bd00b7e314bdb05340fb6ef' 
  AND token = 'SCATXhxHORD0dcB7k0FV07p6+H0mnJ/B+2d2maOyQh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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