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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb04f75f165950c38b822680557f934532795da21dfbbf728755efd9cd78efd' 
  AND token = 'uuC0173gNtbzOAea9zHbunupBNeIPxs3FvB3h51b+l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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