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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34062b98b97ab575d0a6645a92c9ed9a9d1f05be12562b2aff07ab63b5371be1' 
  AND token = 'OiIO0mlc4FYgBuxfkBI/2u6k3IBSS4KC1dVcKiybd28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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