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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea2a013522b4e5f13244d0101dc67ddeb75efcd9667eede382b779ca72c3397' 
  AND token = 'pP4B9wyCS64e8YxuYeZVmA3UjKQp9GXHtYkd6/ADD6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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