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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6bf7c83421a9aa87d66096b63af409860541b3321acb41de3eb005f36ce544' 
  AND token = 'JBdxS9C2ol3xcMy99EhwwD4vtMqOWrEHKV8GwOYyT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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