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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432b0f89b592dfb76d627edd89fdd58c6e9e99c0960ac09e1e011c139a9bfffc' 
  AND token = 'kbPMfM/ph96ZaKIzw4u+iCqdCt6wMLQuxeI+Sk+S8ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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