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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3b5b3098f0ab290762b1474d6790b4c9ca8aaf798a1695f8e545f50afe6706' 
  AND token = 'atxGeV/JSnJ38rdR6YxGKU38bieN+XfODwOg8KJkK4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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