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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d8a2ee996ea8beb5d4836abe8268f312e898da806ebabb6e5672ff4c03da9a' 
  AND token = '3eHiQxeVk6FPWUfVL6ZM2htu9651Eg3Lv0nxSHvU98Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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