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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5b5586e79a2678b3196a96d1f99fa30881bba244f8d72cb829fe73a3259251' 
  AND token = 'iFXvl5AIliau5Y35Si0/63gCi+T/Tkln0eej3NK8b9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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