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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e1ff39a7d2ac9ecd6da0e230177287811f339644b4ccecb3ceeee4bcb7de1c' 
  AND token = 'y/4Ys47XResRg4VMYRmaIGNOVYVjLedxI15Vu12gBvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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